US3700608A
Expired / Lapsed
US
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Process for preparing alkylene oxide polymer
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1971-01-07
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Granted: 1972-10-24
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Expires: 1991-01-07
Abstract
Abstract A PROCESS FOR PREPARING ALKYLENE OXIDE POLYMERS OR COPOLYMERS HAVING HIGH MOLECULAR WEIGHTS COMPRISING POLYMERIZING AT LEAST AN ALKYLENE OXIDE IN THE PRESENCE OF A TERNARY CATALYST SYSTEM COMPRISING AN ORGANO-ALUMINUM COMPOUND, AN ORGANO-ZINC COMPOUND AND AN ORTHOPHOSPHORIC ACID IS DISCLOSED.
Inventors
- 👤 Katsuji Ueno
- 👤 Takao Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:35
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |